<!DOCTYPE html> 
<html lang="en"> 
<head> 
<meta charset="utf-8"> 
<title>Bootstrap Version2.0 form error example</title> 
<meta name="description" content="Bootstrap Version2.0 form error example from w3cschool.cc."> 
<link rel="stylesheet" href="bootstrap.min.css">
</head>
<body>
<form class="well">
  <label>标签名称</label>
  <input type="text" class="span3" placeholder="请输入文字...">
  <label>标签名称</label>
  <input type="text" class="span3" placeholder="请输入文字...">
 <button type="submit" class="btn btn-danger">提交</button>
</form>

</body>
</html>